# GRC with 2 USRP X310 motherboards and 4 channels

**URL:** <https://www.ruby-forum.com/t/grc-with-2-usrp-x310-motherboards-and-4-channels/241353>\
**Category:** GNU Radio\
**Created:** [March 31, 2015, 9:17pm UTC](https://www.ruby-forum.com/t/grc-with-2-usrp-x310-motherboards-and-4-channels/241353 "2015-03-31T21:17:27Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [March 31, 2015, 9:17pm UTC](https://www.ruby-forum.com/t/grc-with-2-usrp-x310-motherboards-and-4-channels/241353/1 "2015-03-31T21:17:27Z")

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I need to set up 2 X310 motherboards to do a 4 channel receive using  
Gnuradio-Companion under Ubuntu 14.04 LTS, Under GRC, it seems not  
straighforward to specify the four different carrier frequencies (all  
four channels have different center freq).  
Pl. help.

Thanks,

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**Author:** ![Trek](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/7feea3/32.png) [@Trek](https://www.ruby-forum.com/u/Trek)\
**Post date:** [March 31, 2015, 9:33pm UTC](https://www.ruby-forum.com/t/grc-with-2-usrp-x310-motherboards-and-4-channels/241353/2 "2015-03-31T21:33:25Z")

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Hi Trek,

you should be able to configure two X300 by using something like  
(assuming your X310s are network-attached and have the given IP  
addresses)  
addr0=192.168.10.2,addr1=192.168.10.3

You should then be able to adjust the num\_mboards field and the  
num\_channels field.

Please let us know of any problem you encounter and can’t overcome.

Best regards,  
Marcus M?ller